WO2002051212A1 - Material for organic electroluminescence device and its manufacturing method - Google Patents
Material for organic electroluminescence device and its manufacturing method Download PDFInfo
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- WO2002051212A1 WO2002051212A1 PCT/JP2001/010966 JP0110966W WO0251212A1 WO 2002051212 A1 WO2002051212 A1 WO 2002051212A1 JP 0110966 W JP0110966 W JP 0110966W WO 0251212 A1 WO0251212 A1 WO 0251212A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/18—Deposition of organic active material using non-liquid printing techniques, e.g. thermal transfer printing from a donor sheet
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/10—Transparent electrodes, e.g. using graphene
- H10K2102/101—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO]
- H10K2102/103—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO] comprising indium oxides, e.g. ITO
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/141—Organic polymers or oligomers comprising aliphatic or olefinic chains, e.g. poly N-vinylcarbazol, PVC or PTFE
- H10K85/146—Organic polymers or oligomers comprising aliphatic or olefinic chains, e.g. poly N-vinylcarbazol, PVC or PTFE poly N-vinylcarbazol; Derivatives thereof
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6574—Polycyclic condensed heteroaromatic hydrocarbons comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
Definitions
- the present invention relates to a method for producing a material for an organic electroluminescent element by injecting a compound forming a luminescent center by molecular injection using a laser, and a material for an organic electroluminescent element obtained by the method. And an organic electroluminescent device using the material for an organic electroluminescent device.
- EL devices electoru-luminescent devices
- inorganic EL devices are classified into inorganic EL devices and organic EL devices according to the materials used.
- Some inorganic EL devices using inorganic phosphor molecules have been put into practical use, and are used in backlights of watches and the like.
- organic EL devices are superior to inorganic EL devices in terms of high brightness, high efficiency, and high-speed response, and are expected to be put to practical use.
- the electroluminescent device is composed of a compound having an electron transport function, a hole transport function, and a luminescent center forming function.
- As its structure there are reports of a single-layer type in which one layer has all the above functions, and a multilayer type in which different layers have each function.
- the light emission principle is thought to be based on the fact that electrons or holes injected from a pair of electrodes recombine in the light emitting layer to generate excitons, which excite the light emitting material molecules forming the light emitting layer. I have.
- a low molecular weight compound having high luminous efficiency or a high molecular compound having high physical strength is used as a compound constituting each layer.
- film formation is performed by vapor deposition
- film formation is often performed by applying a solution.
- JP-A-8-96959 and JP-A-9-63770 disclose that a plurality of types of fluorescent dyes are dispersed in a polymer binder having an electron transport function and a hole transport function.
- An organic EL device having a single light-emitting layer formed by the method is disclosed. It has been reported that in these organic EL devices, each luminescent compound emits light alone and exhibits white light as a whole. In addition, the emission intensity is less likely to be lower than that of an organic EL device having a multilayer structure.
- organic EL elements form a film by a solution coating method in which a polymer binder and a fluorescent dye are dispersed in a specific solvent and applied to a substrate. Therefore, fine patterning, especially multicolor patterning (full color patterning) is performed. —Conversion) is difficult.
- Examples of the multicolor patterning method include a color filter method, a color conversion method, an ink jet method by TR Hebner et al. (App 1. Phys. Le 1 1.72, 5 (1998) p. 5 19), Kido et al. Photobleaching method has been reported.
- the color filter method and the color conversion method have an advantage that the patterning of the light emitting layer is not required, but the conversion efficiency is reduced because the light passes through the filter.
- the pattern formed by the inkjet has a conical shape with a high center, and has poor surface smoothness, so that it is difficult to form electrodes uniformly.
- the ideal cross-sectional pattern is a quadrangle, but it is circular by the inkjet method.
- the size of the pattern greatly depends on the drying conditions and the concentration of the solution.
- the photobleaching method only a special luminescent center compound that loses fluorescence due to UV oxidation can be used, and the colors that can be expressed are limited.
- a polymer compound having high physical strength can be used, but fine patterning is difficult. Also, in the above patterning method, not only compounds that can be used are limited, but also surface smoothness suitable for an organic EL device is provided. Can not get the film.
- Japanese Patent Application Laid-Open No. Hei 6-2974757 discloses a functional material or a solid material containing a functional material (A) and a solid material into which a functional component is injected (B).
- a method is disclosed in which a functional component is injected into a solid material (B) by irradiating the functional material with a pulse laser. This document describes that the injection position of the functional component can be controlled by adjusting the laser irradiation position.
- JP-A-8-106006 discloses a source film in which a dye capable of absorbing one pulse of laser light is dispersed in an organic polymer compound, and an organic polymer compound which can transmit a pulse laser. in close contact with the motor one gate Ttofirumu consisting, c the method of injecting dye into evening in one Getting Tofirumu by irradiating a pulsed laser beam from the target film side at an intensity of or below the ablation threshold value of the source film is disclosed
- the molecular injection method can be used for producing color filters for display.
- an image can be formed by moving the spot position of the laser or the source film and the evening film, and in the embodiment, the sample is moved in parallel to form a linear image. Is formed.
- Japanese Patent Application Laid-Open No. 2000-15058 discloses a source including a luminescent center-forming compound capable of absorbing laser light and a target having an electron transport function and / or a hole transport function.
- a method for producing a material for an organic electroluminescent device by injecting a luminescent center forming compound into a target by irradiating the target with a pulsed laser beam at an intensity equal to or lower than an abrasion threshold of the source. It has been disclosed. This document describes that the pattern shape can be freely set by irradiating a laser beam through a photomask.
- an object of the present invention is to enable fine patterning even when a polymer compound is used as a material for an EL device, and to provide a simple and effective method.
- An object of the present invention is to provide a material for an organic EL device (particularly, a film for an organic EL device) into which a compound for forming a luminescent center can be efficiently injected, a method for producing the same, and a material for an organic EL device obtained by the method.
- Another object of the present invention is to provide a material for an organic EL device having excellent surface smoothness and good contact with an electrode, and an organic EL device using the same. Disclosure of the invention
- the present inventors have found that, in a molecular injection method using a source composed of a light-emitting center-forming compound, (1) laser light is moved relative to a target.
- the method of injecting the luminescent center-forming compound into the target, or (2) the method of injecting the luminescent center-forming compound into the evening by using the interference light of the laser makes it possible to easily perform fine patterning. We found that we could do it efficiently, and completed this invention.
- the source is formed by irradiating a laser beam to a source having at least one function selected from an electron transport function and a hole transport function.
- a method for producing a material for an organic electroluminescence device having an emission center by injecting a compound for forming an optical center comprising the steps of: (1) irradiating a laser beam while moving it at least relative to a target. A light emission center is formed in a predetermined pattern, or (2) a light emission center is formed in an area of the target corresponding to the interference pattern of the interference light by irradiating the interference light of one laser beam.
- the source and the target which are in contact with each other, may be moved with respect to the laser beam to form a light emission center in a predetermined pattern.
- laser light may be applied through a waveguide, or laser light may be applied using an optical fiber.
- the laser light is moved relative to the target and irradiated.
- the emission center may be formed by moving the source with respect to one laser beam.
- the laser beam may be a pulsed laser beam, or the laser beam may be moved relative to the target in synchronization with the pulse period.
- one laser beam from the same light source may be divided into a plurality of optical paths, and interference light may be generated by an optical path difference.
- one laser beam may be guided to the hole-slit to cause interference, or may be caused to interfere via a plurality of reflection paths for reflecting one laser beam.
- laser light may be irradiated at an intensity equal to or lower than the source abrasion threshold.
- the laser beam may be a pulse laser beam.
- the target may be an organic polymer.
- the target may be composed of a compound having at least one function selected from an electron transport function and a hole transport function, and an organic polymer having a film forming ability.
- the compound may be an oxadiazole derivative having an electron transport function and / or an aromatic tertiary amine having a hole transport function.
- the present invention also includes a material for an organic EL device obtained by the above manufacturing method, and an organic EL device using the material for an organic EL device.
- FIG. 1 is a schematic diagram for explaining a method (1) which is an example of a method of injecting a luminescent center forming compound.
- FIG. 2 is a schematic diagram for explaining a method (2) which is another example of a method for injecting a luminescent center forming compound.
- FIG. 3 is a schematic cross-sectional view showing one example (single-layer structure) of the organic electroluminescent device of the present invention.
- FIG. 4 is a schematic cross-sectional view showing another example (multilayer structure) of the organic electroluminescence element of the present invention.
- FIG. 5 shows still another example of the organic electroluminescent device of the present invention. It is a schematic sectional drawing which shows the example (multilayer structure) of FIG.
- FIG. 6 is a schematic cross-sectional view showing another example (multilayer structure) of the organic electroluminescence device of the present invention.
- FIG. 7 is a schematic diagram for explaining another manufacturing method in the method (1) of the present invention.
- the source only needs to contain at least the luminescent center forming compound, and may be composed of the luminescent center forming compound alone or the luminescent center forming compound and a binder.
- the luminescent center forming compound a compound that functions as a luminescent center compound for an organic EL device and that can absorb laser light, in particular, a compound that emits light when excited by electrons and Z or holes (holes) is used. it can.
- Examples of the luminescent center forming compound include bis (CH alkyl-benzoxazozyl) thiophene, 2,5_bis (5-1-tert-butyl-2-benzoxazoyl) -thiophene, thiophene, Coumarins such as coumarin 6 and coumarin 7; 4- (dicyanomethylene) —2-methyl-16— (p-dimethylaminostyryl) -14H—pyran and other 4- (dicyano C 4 alkylene) —2-C Bok 4 alkyl one 6 - (p-di-alkylamino styryl) Single 4 H- pyran, heterocyclic ring containing quinacridone oxygen atom, such as, nitrogen atom and one heteroatom even without least selected from sulfur atom compounds; rubrene, condensed polycyclic hydrocarbons such as perylene emission; 1, 1, 4, 4 - Tetorafue two Lou 1, 3-tetra C 6, such as butadiene (TPB)
- Nile Red and Coumarin 6 are shown below.
- Nile Red is 580 nm (red emission) and the emission wavelength of Coumarin 6 is 490 nm (green emission).
- luminescent center forming compounds may be used alone or in combination of two or more.
- thermoplastic resin thermosetting resin
- thermoplastic resin examples include olefin resins such as polyethylene, polypropylene, ethylene-propylene copolymer, and polybutene; polystyrene, rubber-modified polystyrene (HIPS), acrylonitrile-styrene copolymer, acrylonitrile-butadiene styrene.
- olefin resins such as polyethylene, polypropylene, ethylene-propylene copolymer, and polybutene
- polystyrene rubber-modified polystyrene (HIPS), acrylonitrile-styrene copolymer, acrylonitrile-butadiene styrene.
- HIPS rubber-modified polystyrene
- Styrene resins such as styrene copolymers; Acrylic resins [Alkali resins such as (meth) acrylic monomers (eg, methyl (meth) acrylate, ethyl (methyl) acrylate, butyl (meth) acrylate) Le (meth) Akuri rate, hydroxy E chill (meth) Akuri rate, hydroxypropyl (meth) Akuri rate such as human Dorokishi C 2 _ 4 ⁇ alkyl (meth) Ata Li rate, glycidyl (meth) Akurireto,
- thermosetting resins examples include phenolic resins, amino resins (urea resins, melamine resins, etc.), thermosetting acrylic resins, unsaturated polyester resins, alkyd resins, diaryl phthalate resins, epoxy resins, silicone resins, and the like. Can be
- binders may be used alone or in combination of two or more.
- the content of the luminescent center forming compound in the source is not particularly limited, and is about 0.1 to 100% by weight, preferably about 1 to 90% by weight, and more preferably about 5 to 80% by weight.
- the content of the luminescent center-forming compound is not particularly limited, but, for example, 0.1 to 60 parts by weight with respect to 100 parts by weight of the binder. Parts by weight, preferably about 1 to 30 parts by weight, and more preferably about 3 to 20 parts by weight.
- the sauce is usually used in the form of a film.
- the source may be the luminescent center-forming compound alone or formed on a substrate or an evening target. May be a film of the luminescent center forming compound and the binder.
- the substrate When irradiating a laser beam from the source side, the substrate only needs to be transparent enough to transmit the laser beam.
- a glass plate such as soda glass, alkali glass, quartz glass, or polyester or polystyrene
- polymer sheets or films such as acrylic resins, vinyl resins (polyvinyl acetate, etc.), polysulfone, and polyestersulfone.
- the method for producing the source film is not particularly limited, and a conventional method (for example, a dry method such as a vapor deposition method (eg, a vacuum deposition method), or a solvent such as spin coating, dip coating, or die coating is used. Wet coating method).
- the film may be formed by a conventional film manufacturing method (for example, a casting method or an extrusion method).
- solvents eg, water; alcohols such as methanol and ethanol; esters such as ethyl acetate and isobutyl acetate); acetone, methyl ethyl ketone; Ketones such as toluene; aromatic hydrocarbons such as toluene; alicyclic hydrocarbons such as cyclohexane; halogenated hydrocarbons such as chloroform and chlorobenzene; ethers; cellosolves; Etc.
- the thickness of the film (or coating) is not particularly limited, but may be about 0.1 to 50 xm, preferably about 0.1 to 30 im, more preferably about 0.5 to 20 m. Good.
- the source may not be formed in a pattern, but may be formed in a predetermined pattern.
- the source may be formed on a substrate (substrate) or a target, if necessary. It may be used as.
- a source may be obtained by patterning a film or sheet containing a luminescent center forming compound by a method such as punching.
- the substrate is transparent enough to transmit laser light.
- glass plates such as soda glass, non-alkali glass, and quartz glass, or polyester, polystyrene, acrylic resin, vinyl resin (polyvinyl acetal, etc.), polysulfone, and polyethersulfone And a polymer sheet or film.
- the pattern is selected according to a desired application. For example, a one-dimensional pattern [dot-like (dot-like), linear (eg, parallel line, random, lattice, etc.) ], Or a two-dimensional pattern [a planar shape (for example, a polygonal shape such as a circular shape, an elliptical shape, a triangular shape, a square shape, a star shape, etc.)].
- a method for forming a predetermined pattern on a substrate for example, printing such as screen printing, an ink jet method, a melt transfer or thermal transfer method, or a vapor deposition method (sublimation printing) performed in combination with masking is used.
- a predetermined pattern can be formed on the target.
- the evening get is not particularly limited as long as it has at least one function selected from the electron transport function and the hole transport function, and (I) at least one selected from the electron transport function and the hole transport function.
- the target can transmit the laser light.
- Examples of the resin (I) having at least one function selected from the electron transport function and the hole transport function include polyphenylenevinylenes [eg, polyphenylenevinylene, poly (2,5-dimethylethoxyphenylenevinylene); ), poly naphthalene vinylene substituents such as (C ⁇ 1 () may have a an alkoxy group) (6 _ 1 2 Arirenbi Polyphenylenes (especially polyparaphenylenes) [having substituents such as polyparaphenylene and poly 2,5-dimethoxyparaphenylene (C ⁇ alkoxy group, etc.)] to homo- or copolymer of good phenylene optionally]; Porichiofen such [such as poly poly (3 _ alkylthiophene) C - 20 alkylthio Fen, poly poly C 3, such as (3-hexylthiophene-cyclohexylene) _ 2 .
- polyphenylenevinylenes eg, poly
- Cycloalkyl thiophenes poly (3 - (4 _ n-to Kishirufe sulfonyl) Chiofen) substituent (C Bok 1 () alkyl group) which may have a C 6 _ 2G ⁇ Li one Le thiophenes such as Homo- or copolymers]; polyfluorenes such as poly- 20 alkylfluorene; poly-N_vinylvinylbenzene (PVK), poly-4-N, N-diphenylaminostyrene, poly (N -(Diphenylamino) phenyl methacrylamide), poly (N, N'-diphenyl-N, N 'bis (3-methylphenyl) 1-1,1, -biphenyl-4,4' phenyl Minomethacrylamide) (PTP DMA), poly (4-naphthyl-1,3,4-oxadiazole) at least selected from hole and electron transport functional groups in the main
- PVK is amorphous and has excellent heat resistance (glass transition temperature Tg: 224 ° C).
- the degree of polymerization of the PVK is not particularly limited, but is, for example, 200 to 500 (for example, 300 to 300), preferably 500 to 200 (for example, 500). 0 0 to 150 0).
- the resin (I) may have an electron transporting function or a hole transporting function.
- Examples of the compound having an electron transport function include oxaziazole derivatives [eg, 2- (4-biphenyl) -15_ (4_tert-butylphenyl) -1,3,4-oxaziazole (PBD), 2,5-bis (1-naphthyl) -1,3-, 4-oxaziazol (BND), 1,3-bis [5- (4-tert-butylphenyl) -1,3,4- Oxadiazole] benzene (BP ⁇ B), 1,3,5-tris [5- (4-tert-butylphenyl)-1,3,4-oxadiaol] benzene (TP ⁇ B), 1, 3, 5-tris [5- (1-naphthyl) - 1, 3, 4 Okisajiazoru] benzene (TNOB) which may have a substituent such as C 6 - Okisajiazo Ichiru with ⁇ Li Ichiru group Derivatives]; diphenoquinones [for example
- Diphenoquinones which may have 1,2,3,4,5-pentane-1,3-cyclopentene (PPCP); tris (8-quinolinolato) aluminum (III) And quinolinic acid complexes such as bis (benzoquinolinolato) beryllium complex and tris (10-hydroxybenzo [h] quinolinylato) beryllium complex.
- PPCP 1,2,3,4,5-pentane-1,3-cyclopentene
- PPCP 1,2,3,4,5-pentane-1,3-cyclopentene
- PPCP 1,2,3,4,5-pentane-1,3-cyclopentene
- PPCP 1,2,3,4,5-pentane-1,3-cyclopentene
- quinolinic acid complexes such as bis (benzoquinolinolato) beryllium complex and tris (10-hydroxybenzo [h] quinolinylato) beryllium complex.
- PBD is preferred.
- Compounds having a hole transporting function include, for example, ⁇ , ⁇ ′-diphenyl mono-, ⁇ ′-bis (3-methylphenyl) — .1, 1,, —biphenyl—4,4′—diamine (TPD), ⁇ , ⁇ 'diphenyl — ⁇ , ⁇ ' — bis (1 naphthyl) -1, 1, 1 biphenyl 2, 4,4, diamine (NPD), 1, 1 bis [(di-1 4 _ trilamino) phen Nyl] cyclohexane, N, N, N, -tetra (3-methylphenyl) 1-1,3-diaminobenzene (PDA), 4,4 ', 4 "-tris (3-methylphenyl Enilamino) triphenylamine (m—MTDATA), 4, 4 ', 4 "—tris (1-naphthyl) Phenylamino) triphenylamine (1-TNATA;), 4, 4 4 —
- the compounds may be used alone or in combination of two or more. Among these compounds, compounds that emit light when excited by electrons and / or holes may be used as the luminescent center-forming compound.
- the ratio of the above components contained in the resin (I) (for example, PVK) can be selected within a range that does not impair the function as a material for an organic EL device. , 10 to 300 parts by weight, preferably about 20 to 200 parts by weight.
- the target is composed of the resin (I) and the compound, a single-layer structure is possible in the organic EL device described later, which not only improves the luminous efficiency but is economically advantageous.
- the resin used in the resin composition (II) is not particularly limited.
- various binders having a film-forming ability described above such as a thermoplastic resin and a thermosetting resin
- These resins may be provided with at least one of an electron transport function and a hole transport function.
- Examples of the compound used for imparting the electron transport function and the Z or hole transport function include the same compounds as described above.
- the amount of the compound having an electron transport function or a hole transport function is preferably 100 to 300 parts by weight (for example, 100 to 200 parts by weight), preferably 100 to 100 parts by weight of the binder resin. 20 to: about 100 parts by weight (for example, 20 to 80 parts by weight).
- the resin (I) and the resin composition (II) may be used in combination. Both may provide one function.
- the form of the target is not particularly limited, but is usually used in the form of a film.
- the target is formed by the same method as that of the source, and is usually formed on the substrate described above.
- the method for producing a material for an organic EL device of the present invention is a method of irradiating a laser beam and injecting a luminescent center forming compound in a source into the target, and (1) applying a laser beam to at least the target. Relative to each other to form a light emission center in a predetermined pattern, or (2) by irradiating a single laser beam of interference light, the light beam corresponding to the interference pattern of the interference light in the evening target An emission center is formed in the region.
- the laser beam may be emitted from the source (A) side or the target (B) side.
- a film is used as a target to produce a film for an organic EL device. Further, the target and the source may be in contact with each other.
- the laser light used in the present invention varies depending on the kind of the luminescent center forming compound to be used, and examples thereof include a laser light having an oscillation wavelength in the range of 190 to 110 nm.
- the frequency is, for example, about 0.5 to 50 Hz, preferably about 0.5 to 30 Hz.
- the pulse width varies depending on the wavelength of one laser beam, but is 10 PS to 10 S (for example, 10 PS to 1 S), preferably 50 ps to: LOO ns (for example, 10 0 ps to 50 ns). The shorter the pulse width, the more the decomposition of the luminescent center forming compound can be suppressed, and the less likely it is to be damaged.
- the laser light source examples include a gas laser [ArF excimer laser (193 nm), a KrF excimer laser (248 nm), an XeCl excimer laser (30) 8 nm), XeF excimer laser (351 nm), nitrogen laser (337 nm)], pigment laser (nitrogen laser, excimer laser, or YAG Laser excitation, 300-10000 nm), solid-state laser ([Nd: YAG excitation, semiconductor laser excitation, etc.); ruby laser (694 nm), semiconductor laser (650-9) 80 nm), tunable diode laser (630-155 nm), titanium sapphire laser (Nd: YAG excitation, 345-500 nm, 690-100) 0 nm), Nd: YAG laser (FHG: 266 nm, THG: 354 nm, SHG: 532 nm, fundamental wave: 1064 nm)].
- gas laser ArF excimer laser (19
- the luminescent center-forming compound can be efficiently injected into the target at night by irradiating laser light with an intensity equal to or lower than the ablation threshold of the source (that is, the luminescent center-forming compound or binder).
- the injection amount can be controlled by adjusting the laser intensity, wavelength, and number of irradiations.
- the abrasion threshold of the source (A) differs depending on the kind of the luminescent center forming compound constituting the source. It also depends on the wavelength and pulse width of the laser light. Therefore, in the present invention, the ablation threshold is defined as follows.
- the source is irradiated with one laser beam to the source, and the source is contact-type surface shape measuring device (for example, The minimum laser beam intensity (mJ / cm 2 ) at the irradiation surface, which can cause a shape change of 50 nm or more on the laser irradiation surface when observed with SLOAN DEKTAK3030ST), is considered in the present invention. It is defined as an abrasion threshold.
- FIG. 1 is a schematic diagram showing a manufacturing method in the method (1) of the present invention
- FIG. 2 is a schematic diagram showing a manufacturing method in the method (2) of the present invention.
- source 1, target 2, luminescent center forming compound 3, substrate 4 on the target side, substrate 5 on the source side, and hole 6 are shown.
- FIG. 1 first, a source 1 formed on a substrate 5 and a target 2 formed on a substrate 4 are brought into contact with or in close contact with each other. The light is irradiated while being moved relatively to the target. Then, the luminescent center-forming compound that has absorbed one laser beam has a high translational energy and is injected into the target 2 without decomposition, thereby obtaining a material (particularly a film) for an organic EL device.
- a source 1 formed on a substrate 5 and a target 2 formed on a substrate 4 are brought into contact with or in close contact with each other, and a laser having an intensity equal to or lower than an abrasion threshold of the source is applied from the source 1 side.
- the light is guided to the hole 6 to cause interference and irradiate.
- the emission center forming compound that has absorbed the interference light of one laser beam has a high translational energy, and is injected undecomposed into a region of the target 2 corresponding to the interference pattern of the interference light, An organic EL element material (especially a film) can be obtained.
- the number of irradiations is usually 1 to 200 times, preferably 1 to 150 times, and more preferably 1 to 100 times (for example, 5 to 50 times). ) Degree.
- one laser beam may be irradiated from the target side.
- the source may be formed directly on the target as a surface layer.
- the source formed on the target can be removed from the target after injection of the luminescent center-forming compound.
- the source may be formed of a removable or peelable surface layer.
- the substrate to be used only needs to be transparent enough to transmit one laser beam.
- the above-described substrates a glass plate such as quartz glass, a polymer sheet or a film
- the substrate used when forming the source or target film may be used as it is, or may be newly formed.
- the cross-sectional shape of a laser beam is not particularly limited, and may be a circular shape, an elliptical shape, a polygonal shape (such as a triangle or a square), or the like.
- Average laser beam plane The product is not particularly limited, and can be selected from a wide range according to the purpose. For example, 0 0 1 ⁇ 5 0 0 0 m 2, preferably from 0:..! ⁇ 4 0 0 0 ⁇ m 2, and more preferably. 1 to 3 0 0 0 / im 2 or so.
- the beam area of the laser beam may be reduced to a desired size, and a pattern may be formed by scanning a predetermined pattern.
- the emission center forming compound is injected into a predetermined area into the target by using a pre-formed source or by relatively scanning the laser light with a photomask interposed. May be.
- a plurality of sources having different luminescent center forming compounds may be used. For example, if a compound that can emit light in the visible light range (a compound that can emit light such as yellow, red, green, or blue) is used, a desired emission color can be obtained. Further, in the method (2), luminescent colors such as red, green, and blue are arranged (for example, a vertical stripe, a delta arrangement, a square arrangement, and the like) so as to correspond to interference fringes using a plurality of sources. It is also possible. Therefore, according to the present invention, it is possible to obtain a material for an organic EL device having a pattern of various colors and various shapes.
- the feature of the above method (1) is that at least the laser beam is relatively moved with respect to the target, and the luminescent center forming compound of the source is injected into the target in a predetermined pattern.
- the source and the target are positioned in contact with each other, the source and the target may move together, and the source can move relative to the evening target. It may be.
- the irradiation of the laser beam can be performed, for example, by (1-1) a method of moving the optical path of the laser beam with respect to the source and the evening target.
- (1-1) a method of moving the optical path of the laser beam with respect to the source and the evening target.
- Laser Any method of moving the source and the target with respect to the optical path of light may be used.
- the optical path of the laser light can be moved not only by the relative movement of the laser light source but also by means for controlling (1-3) the optical path.
- Means for controlling the optical path include physical or physical optical means (for example, optical fiber, reflecting mirror (total reflection mirror, half mirror, etc.), lens (condensing lens, etc.), deflection prism Using an optical element (or optical member) or a combination thereof, and electro-optical means (for example, applying a voltage to an electro-optic crystal (birefringent crystal)).
- Methods include moving the optical path of the light beam and using ultrasonic waves.
- the material was a medium
- the piezoelectric thin film Bok Ransuju colonel in the medium e.g., L i n B_ ⁇ 3 and Z n O of which the piezoelectric elements
- the waveguide can be moved.
- the laser beam can be moved not only linearly but also at least two-dimensionally relative to at least the target. Therefore, the luminescent center forming compound of the source can be efficiently injected in a desired pattern at a time, and the luminescent center can be formed in a two-dimensional pattern.
- the source and the target are brought into contact with each other, and the target surface or the source surface is fixed on a table movable in the X-Y axis direction with the target surface or the source surface facing upward.
- a sensor for detecting displacement in the X-axis and Y-axis directions is provided, and the table is moved in the X-axis and Y-axis directions in response to a detection signal from the sensor, so that high-level positioning can be easily performed.
- Two-dimensional fine patterning is possible.
- a memory for storing the data of the pattern and a controller for moving the laser beam and / or the table in response to the pattern signal are provided, so that the data can be easily stored. —You can do it.
- the target and the laser light are relatively moved when at least one laser is moved relative to the target by the above method in synchronization with the pulse period. And the luminescent center forming compound can be efficiently injected into the target.
- the target may be moved with respect to the laser beam, but usually, the laser beam or the optical path of the laser beam is often controlled in synchronization with the pulse period.
- At least the laser beam may be moved relative to at least the target, and the source may be moved relative to the laser beam.
- the luminescent center forming compound is consumed and the luminescent center cannot be effectively formed.
- the luminescent center forming compound can be effectively and efficiently obtained. Can be injected.
- the source includes a plurality of regions composed of the respective luminescent center-forming compounds, for example, a region composed of the yellow luminescent center-forming compound, a region composed of the red luminescent center-forming compound, A region composed of a blue light-emitting center-forming compound may be formed.
- a single source can be used to emit light by moving the source relative to the laser and / or the target in the X and Z or Y directions.
- a plurality of luminescent centers of different colors can be formed.
- FIG. 5 is a schematic view showing another manufacturing method in the method (1).
- the optical path (light source or waveguide) of the laser light is moved in the vertical and / or horizontal direction with respect to the target, and the laser light is moved to the region composed of the green emission center forming compound of the source. Irradiate and emit green After the light center is formed on the target, the source is moved with respect to the laser light, and then the laser light is applied to the area composed of the compound that forms the red light emission center to form the red light emission center on the target. I do. Further, by forming a blue emission center in the same manner as above, an organic EL device material capable of emitting full color light can be manufactured.
- a target is irradiated with a pulse laser beam through a source while scanning in a vertical direction and a Z direction or a horizontal direction, and the source 1 and the evening target 2 are irradiated with laser light.
- the source 1 can be moved in the X-axis and / or Y-axis directions by the feed mechanism.
- the source when the source is moved with respect to one laser beam, a single source can be used to form a plurality of emission centers having different emission colors, and the emission center forming compound can be used without waste. Since the compound for forming the luminescence center can be injected efficiently, it is advantageous in terms of cost. Further, the source may be formed of a film of indefinite length or the like, and when such a film is used, a compound for forming a luminescent center can be continuously produced.
- the feature of the above method (2) is that the high coherence of the laser light is used, and the center of the light emission is located in the region of the target corresponding to the interference pattern of the interference light by the interference of the laser light. The point is to form.
- interference includes diffraction (which is considered to be interference of small waves (secondary waves) based on Huygens' principle) ("Basics and Experiments on Lasers", by Ishi Matsudaira, Kyoritsu Shuppan Co., Ltd.) Published, 11th edition, 54 pages).
- the interference of one laser beam can be caused by dividing one laser beam from the same light source into a plurality of optical paths, and this optical path difference.
- the method for causing the laser light to interfere is not limited to the method using a hole as shown in FIG. 2, but includes, for example, (2-1) a method in which laser light is guided to a hole or a slit to cause interference, and (2) -2) Any method of interfering laser light through a plurality of reflective paths that can reflect the laser light may be used.
- the slit width in the case of a hole, the average diameter of the hole
- the slit width is not particularly limited, and is 0.11 to 100 mm, preferably 0.1 to 10 mm, More preferably, it is about 0.5 to 5 mm (for example, 0.5 to 3 mm).
- the shape of the hole is not particularly limited, and may be a circle, an ellipse, a polygon (a triangle, a quadrangle, etc.). If the shape of the hole is non-circular, the average diameter indicates the average diameter of the circumscribed circle.
- the holes and slits may be single holes or slits, or a plurality of holes (for example, double slits) may be used. Also, a combination of a hole and a slit may be used.
- the laser beam guided to the hole or slit interferes (diffuses when a single hole or slit is used) due to an optical path difference, and forms interference fringes (or diffraction fringes).
- a mirror for example, a semi-transmissive mirror, a reflecting mirror
- a semi-transmissive mirror for example, a reflecting mirror
- an optical path difference between transmitted light and reflected light can be easily generated.
- one laser beam is made incident on a semi-transparent mirror that is arranged at a predetermined angle from the incident direction of the laser beam, some laser beam is transmitted, and the remaining laser beam is emitted in the laser beam incident direction. Reflect in the orthogonal direction.
- the transmitted light is made incident on a first reflecting mirror separated by a predetermined distance from the semitransparent mirror.
- the reflected light is made incident on a second reflecting mirror separated by a distance different from the distance.
- the laser light reflected by the first and second reflecting mirrors and having passed through different reflecting paths is again incident on the semi-transparent mirror, and the laser light obtained is incident on the evening target.
- the laser light obtained is incident on the evening target.
- a desired interference pattern can be obtained.
- one or more of the semi-transparent mirror and the reflecting mirror may be used.
- the laser light is converted into a parallel light beam through a lens (such as a telemeter lens).
- the light may be incident on a semi-transparent mirror.
- the hole diameter or slit width, the position of the mirror, and the like are appropriately selected, and the optical path difference is changed to change the interference fringe interval and the interference fringe.
- the shape can be adjusted, and a desired interference pattern (interference fringe) can be obtained without using a mask or the like.
- interference fringes at minute intervals can be obtained, and fine patterning of the luminescent center forming compound can be easily performed.
- the interference fringes are usually concentric (symmetric) patterns in which the energy at the center is the highest, the injection amount of the compound forming the emission center can be adjusted.
- the injected luminescent center-forming compound is not dispersed or diffused in the target, but has a step type (that is, a depth injected into the evening getter). (A uniform rectangular form). The depth varies depending on the type of the luminescent center-forming compound and the target, the laser intensity, and the like. For example, the depth is 10 to 30 O nm, preferably 15 to 200 11], more preferably 2 to 10 nm. It is about 0 to 1 OO nm.
- the luminescent center forming compound can be injected efficiently without lowering the smoothness of the surface of the material for the organic EL device.
- the organic electroluminescence device of the present invention comprises: a material for an organic EL device obtained by the above method (particularly, a light-emitting layer formed of a target film into which a compound for forming a light-emitting center is injected); and a pair of electrodes. I have.
- a transparent electrode for example, an indium tin monoxide (ITO) electrode
- ITO indium tin monoxide
- a highly conductive metal having a small work function for example, Magnesium, lithium, aluminum or silver
- a film for organic EL May be co-evaporated with a small amount (eg, 1 to 10% by weight) of silver to improve the adhesion of the silver.
- the organic EL device of the present invention can have a single layer structure.
- a layer having the function is formed by a conventional vapor deposition method or solution coating method. It may be laminated by a method such as the following. These layers may be low molecular weight compounds or high molecular weight compounds.
- the structure of the organic EL device can be, for example, a single layer or a multilayer structure shown in FIGS.
- an anode 11 is formed on a substrate 10, on which an emitting layer 12 and a cathode 13 are laminated in this order.
- the anode 21 is formed on a substrate 20. May be formed, and an organic EL element in which a hole transport layer 24, a light emitting layer 22, and a cathode 23 are sequentially stacked thereon may be used.
- an anode 31 is formed on a substrate 30, and an organic EL device in which a light emitting layer 32, an electron transport layer 35, and a cathode 33 are sequentially stacked thereon, as shown in FIG.
- An organic EL device in which an anode 41 is formed on 40 and a hole transport layer 44, a light emitting layer 42, an electron transport layer 45, and a cathode 43 are sequentially stacked thereon may be used.
- each layer constituting the organic EL element is not particularly limited, but is preferably 1 O nm to l im (for example, 10 to 500 nm), preferably 30 to 300 nm, and more preferably 30 to 300 nm. 2200 nm, particularly about 50-20 nm.
- the thickness of the film can be selected from the same range as described above.
- the above-described substrate for example, a substrate transparent to transmit laser light (for example, a glass plate of soda glass, non-alkali glass, quartz glass, or the like, or polyester, polysulfone, or polyether) Polymer sheets such as monoter sulfone or films) can be used. Fabricate flexible organic EL devices In this case, a polymer film is preferred.
- the substrate used at the time of molecule injection may be used as it is, or may be newly formed. According to the method of the present invention, fine multicolor patterning, which has conventionally been difficult with an organic EL device using a polymer compound, is possible in an organic EL device.
- the material for an organic EL device of the present invention (particularly, a film for an organic EL device) has excellent surface smoothness, it has good adhesiveness to an electrode, and further, a luminescent center forming compound is injected into a step type. As a result, when a voltage is applied, not only voltage unevenness does not occur, but also a desired pattern can be accurately formed.
- high-precision positioning is possible by moving at least one laser beam relative to at least one evening target, and fine focusing can be easily performed, and the use of an optical fiber or the like is possible. If this is the case, highly accurate and fine patterning is possible.
- the laser beam at least relative to the target and moving the source with respect to the laser beam the light emitting center-forming compound can be injected efficiently.
- the emission center can be formed in a region corresponding to the interference pattern by the interference light of the laser, utilizing the high coherence of the laser light.
- the interference pattern can be adjusted to a desired shape and interval by appropriately selecting the hole diameter or the slit width, etc., so that fine patterning can be easily performed.
- PPD manufactured by Aldrich
- ITO indium tin monoxide
- a 100-nm-thick evening-get film having an electron-hole transport function was formed on the ITO film by dip coating.
- the source film obtained as above is brought into contact with the target film, and fixed on a table movable in the X-axis and Y-axis directions with the target film surface facing upward, and the beam area 2 Using a laser processing device capable of emitting an XeF excimer laser (wavelength: 351 nm) with a pulse width of 10 ns and an Omm 2 , the table is set in the X-Y axis direction with respect to the laser beam. And the luminescent center forming compound was injected in a pattern of 20 mm 2 .
- a 200 nm thick A1ZLi electrode (manufactured by Kojundo Chemical Co., Ltd., Li content 0.78% by weight) was formed on the target film (sample 1) into which the molecules had been injected by vacuum evaporation. Organic EL device 1 was obtained.
- Polybutylmethacrylate (manufactured by Aldrich Co., Ltd., molecular weight 3.4 X 10 5 ) containing 5% by weight of coumarin 6 (manufactured by Nippon Kosoku Dye Co., Ltd.) is dissolved in chlorobenzene and spin-coated on a quartz substrate. Apply,
- a 2 xm source film was prepared.
- a sample was prepared by contacting the two films obtained as described above, and a third harmonic of the YAG laser (wavelength: 35 nm, pulse width: 3 ns, unit area) was obtained from the target substrate side. Irradiation energy of 20 mJ / cm 2 , beam diameter 1.8 mm) was irradiated 10 times through a 1 mm diameter pinhole.
- a 200 nm thick A1 / Li electrode layer (manufactured by Kojundo Chemical Co., Ltd., Li content 0.78% by weight) was formed on the target film into which the molecules had been injected by vacuum evaporation.
- a luminescence element was obtained.
- the emission shape reflects the shape of the light interference generated when one light of the YAG laser passed through the pinhole, and a green emission ring pattern was confirmed concentrically. Blue emission of PVK was confirmed in the portion where no molecule was injected, and green emission of coumarin 6 was confirmed in the portion where the molecule was injected.
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Electroluminescent Light Sources (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/203,476 US6797920B2 (en) | 2000-12-20 | 2001-12-14 | Material for organic electroluminescent device and its manufacturing method |
| KR1020027010799A KR20020077484A (ko) | 2000-12-20 | 2001-12-14 | 유기 전기발광 소자용 재료 및 그의 제조 방법 |
| EP01271789A EP1347670A4 (en) | 2000-12-20 | 2001-12-14 | MATERIAL FOR ORGANIC ELECTROLUMINESCENCE DEVICE AND METHOD FOR MANUFACTURING SAME |
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|---|---|---|---|
| JP2000387823A JP2002190386A (ja) | 2000-12-20 | 2000-12-20 | 有機エレクトロルミネッセンス素子用材料およびその製造方法 |
| JP2000-387823 | 2000-12-20 | ||
| JP2000-68611 | 2001-03-12 |
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| WO2002051212A1 true WO2002051212A1 (en) | 2002-06-27 |
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| PCT/JP2001/010966 Ceased WO2002051212A1 (en) | 2000-12-20 | 2001-12-14 | Material for organic electroluminescence device and its manufacturing method |
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| Country | Link |
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| WO (1) | WO2002051212A1 (ja) |
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| US7057256B2 (en) | 2001-05-25 | 2006-06-06 | President & Fellows Of Harvard College | Silicon-based visible and near-infrared optoelectric devices |
| US7442629B2 (en) | 2004-09-24 | 2008-10-28 | President & Fellows Of Harvard College | Femtosecond laser-induced formation of submicrometer spikes on a semiconductor substrate |
| US8334057B2 (en) | 2005-06-08 | 2012-12-18 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting element, light-emitting device, and electronic device |
| JP4789706B2 (ja) * | 2005-06-08 | 2011-10-12 | 株式会社半導体エネルギー研究所 | 発光素子、発光装置、電子機器 |
| JP5445990B2 (ja) * | 2006-02-14 | 2014-03-19 | 独立行政法人物質・材料研究機構 | 有機分子の注入方法とその装置 |
| JP5416987B2 (ja) | 2008-02-29 | 2014-02-12 | 株式会社半導体エネルギー研究所 | 成膜方法及び発光装置の作製方法 |
| US8692198B2 (en) | 2010-04-21 | 2014-04-08 | Sionyx, Inc. | Photosensitive imaging devices and associated methods |
| CN103081128B (zh) | 2010-06-18 | 2016-11-02 | 西奥尼克斯公司 | 高速光敏设备及相关方法 |
| US9496308B2 (en) | 2011-06-09 | 2016-11-15 | Sionyx, Llc | Process module for increasing the response of backside illuminated photosensitive imagers and associated methods |
| JP2014525091A (ja) | 2011-07-13 | 2014-09-25 | サイオニクス、インク. | 生体撮像装置および関連方法 |
| WO2014209421A1 (en) | 2013-06-29 | 2014-12-31 | Sionyx, Inc. | Shallow trench textured regions and associated methods |
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| JP2000033263A (ja) * | 1998-07-17 | 2000-02-02 | Japan Science & Technology Corp | 固体材料内部の選択的改質方法及び内部が選択的に改質された固体材料 |
| JP2000150158A (ja) * | 1998-09-01 | 2000-05-30 | Daicel Chem Ind Ltd | 有機エレクトロルミネッセンス素子用材料およびその製造方法 |
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| JP2001167879A (ja) * | 1999-12-09 | 2001-06-22 | Daicel Chem Ind Ltd | 有機エレクトロルミネッセンス素子用材料およびその製造方法 |
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| JPS59123193A (ja) * | 1982-12-29 | 1984-07-16 | 日本精機株式会社 | 電界発光表示素子 |
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